A minimalistic HTTP file server with Flask.
Change in source
app.config["storage"] = "box/"
Running the server with nginx and gunicorn are generally recommended instead of running the script directly, despite being also viable.
$ gunicorn -b 0.0.0.0:25252 app:app
With nginx, you will need to create a port map for the web application, a static content location for the storage configured as in the script, and (preferably) allow larger client_max_body_size.